current sense WK73S wide terminal type flat chip resistors EU features Wide-side termination (reverse-geometry) type flat chip resistor High reliability and performance with T.C.R. -6 100 x 10 /K, resistance tolerance 0.5% Products with lead-free terminations meet EU RoHS requirements. EU RoHS regulation is not intended for Pb-glass contained in electrode, resistor element and glass. AEC-Q200 Tested dimensions and construction Type Dimensions inches (mm) L (Inch Size Code) c c L Wc d t 2A .049.006 .079.006 .012.008 .014.008 .022.004 (0508) (1.250.15) (2.00.15) (0.30.2) (0.350.2) (0.550.1) W 2B .063.006 .126.008 .012.008 .018.006 (0612) (1.60.15) (3.20.2) (0.30.2) (0.450.15) Solder Plating 2H .098.006 .197.006 .016.008 Ni (1020) (2.50.15) (5.00.15) (0.40.2) t .024.004 Plating Inner (0.60.1) Electrode 2J .122.006 .181.006 .016.008 .030.006 Resistive d Film (1218) (3.10.15) (4.60.15) (0.40.2) (0.750.15) Protective Coating Ceramic 3A .122.006 .252.006 .018.008 Substrate (1225) (3.10.15) (6.30.15) (0.450.2) Derating Curve WK73S2B (1W), WK73S3A (2W) 100 100 100 2J (100C) 80 80 80 2H2, 3A3 (95C) 60 60 60 2A, 2B, 2H, 3A (125C) 2B, 3A (115C) 40 40 40 20 20 20 0 0 0 -60 -40 -200420060 80 100 120 140 160 -60 -40 -20 0 20 40 60 80 100 120 140 160 -60 -40 -20 0 20 40 60 80 100 120 140 160 -55 70 155 -55 125 155 -55 95 115 155 Ambient Temperature Terminal Part Temperature Terminal Part Temperature (C) (C) (C) For resistors operated at an ambient temperature For resistors operated terminal temperature of described for each size or above, a power rating of 70C or above, a power rating shall be derated shall be derated in accordance with the derating curve above. in accordance with the above derating curve. Please refer to Introduction of the derating curve based on the terminal part temperature in the beginning of our catalog before use. If you want to use at rated power (*1), use derating curves based on the terminal part temperature ordering information on the right side graph. WK73S 2J T TE 33L0 F Termination Nominal Resistance Type Size Packaging Material Resistance Tolerance TD: 0508, 0612: 7 4mm pitch WK73S 2A: 1W T: Sn 1%: 3 significant figures + 1 D: 0.5% punched paper multiplier R indicates decimal 2B: 0.75W, 1W F: 1% TE: 1020, 1218, 1225: on value <100 2H: 1W J: 5% 7 embossed plastic 5%: 2 significant figures + 1 2J: 1W For further information on multiplier R indicates decimal packaging, please refer to 3A: 1.5W, 2W on values <10 Appendix A All values less than 0.1 (100m) are expressed in m with L as decimal. Ex: 33m, 1% = 33L0 Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use. 10-26-20 114 KOA Speer Electronics, Inc. 199 Bolivar Drive Bradford, PA 16701 USA 814-362-5536 Fax: 814-362-8883 www.koaspeer.com % Rated Power % Rated Power % Rated Power WK73S wide terminal type flat chip resistors applications and ratings Rated Rated Resistance Range () Maximum Maximum Operating Part Power T.C.R. Ambient Terminal Part Working Overload Temp. -6 Designation Rating (X 10 /K) D0.5% F1% J5% Temp. Temp. Voltage Voltage Range E-24/E-96 E-24/E-96 E-24 100 1 - 9.76 1 WK73S2A 1.0W 70C 125C 0~+200 30m - 976m 30m - 910m 200V 400V 0~+300 20m - 29.4m 20m - 27m 800 10m - 27m 0.75W 70C 125C 200 30m - 422m 30m - 390m 100 430m - 9.76 430m - 9.1 430m - 9.76 200V 400V WK73S2B 800 10m - 27m 1 1.0W 70C 115C 200 30m - 422m 30m - 390m 100 430m - 9.76 430m - 9.76 430m - 9.1 800 10m - 24m -55C to WK73S2H 27m - 215m 27m - 200m 200V 400V 200 1.0W 70C 125C +155C 100 220m - 9.76 220m - 9.1 800 10m - 30m 33m - 237m 33m - 220m WK73S2J 1.0W 70C 100C 200 200V 400V 100 240m - 9.76 240m - 9.1 800 10m - 20m 22m - 32.4m 22m - 30m 300 1.5W 70C 125C 200 33m - 357m 33m - 330m 100 360m - 9.76 360m - 9.1 200V 400V WK73S3A 800 10m - 20m 300 22m - 32.4m 22m - 30m 1 70C 115C 2.0W 200 33m - 357m 33m - 330m 100 360m - 9.76 360m - 9.1 Rated voltage = Power rating x resistance value 1 If you want to use at rated power use derating curves based on the terminal part temperature on the right side graph located on previous page. If any questions arise whether to use the Rated Ambient Temperature or the Rated Terminal Part Temperature, please give priority to the Rated Terminal Part Temperature. For more details refer to the Introduction of the derating curves based on the terminal part temperature in the beginning of the catalog Temperature Rise One-Pulse Limiting Electric Power WK73S 2A-3A WK73S 2A-2B 1J WK73S 2H-3A 1000 140 140 2A 3A 120 120 2B 2H/2J 2A 3A 100 100 2B 2H/2J 100 80 80 60 60 3A 10 40 40 2H/2J 2B 2A 20 20 1 0 0 10 20 30540060 70 80 90 100 10 20 30540060 70 80 90 100 .001 .01 .1 1 10 100 1000 Power Rating Power Rating Pulse Duration (ms) (%) (%) Measurement condition Regarding the temperature rise, the value of the temperature The maximum applicable voltage is equal to the max. Room temperature: 25C varies per conditions and board for use since the temperature overload voltage. Please contact factory for resistance PCB: FR-4t = 1.6mm Cu foil thickness: 35m is measured under our measuring conditions. characteristics of continuous applied pulse. Hot spot Terminal environmental applications Performance Characteristics Requirement R (%+0.005) Parameter Limit Typical Test Method Within specified Resistance 25C tolerance T.C.R. Within specified T.C.R. +25C/-55C and +25C/+125C WK73S2A (1W), WK73S2B (1W), WK73S3A (2W): Rated voltage x2.0 for Overload (Short time) 2% 0.2% 5 seconds. WK7S2B, S2H, S2J, S3A: Rated voltage x2.5 for 3 seconds Resistance to Solder Heat 1% 0.2% 260C 5C, 10 seconds 1 second Bending Test 1% 0.1% Holding point 90mm, Bending 1 time, Bending 5mm Rapid Change of Temperature 2% 1% -55C (30 minutes), +125C (30 minutes), 1000 cycles Moisture Resistance 2% 0.2% 40C 2C, 90%-95% RH, 1000 hours, 1.5 hr ON, 0.5 hr OFF cycle Endurance at 70C 2% 0.2% 70C 2C, 1000 hours, 1.5 hr ON, 0.5 hr OFF cycle 0.5%: WK73S (5%) 2%: WK73S (5%) High Temperature Exposure +155C, 1000 hours 1%: all others 0.2%: all others Additional environmental applications can also be found at www.koaspeer.com Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use. 12/10/20 KOA Speer Electronics, Inc. 199 Bolivar Drive Bradford, PA 16701 USA 814-362-5536 Fax: 814-362-8883 www.koaspeer.com 115 1 - 9.1 Temperature Rise (C) Temperature Rise (C) One-Pulse Limiting Electric Power (W) current sense